Ontario



Patented Aug. 11, 1931 Umtrsusm'rss PATENT OFFI Y QQ NORMAN WILLIAMS?Ann HERMAN MIT'rnnM-Emn, or xrronnmin, p v CANADA.

on'rAmo, 1

wrNDsHIELn WIPER Applicationfiled April 19,

This invention relates to windshield wipers of" the type in which apiston, or pistons reciprocating'in a; cylinder, or cylinders, aredirectly connected by flexible connections with a wiper guided 'formovementparallel to the cylinders.- Inv the form shown in our UnitedStates Patent #1,725,436' of August th, 1929 two cylindersand pistonsare employed', one for operatingthe wiper in one direcliion and-tlieother'for operating it in the reverse" direction-. In another known formonec'ylind'er is employedgbut the flexible connections pass throughaxially positioned stufiing boxes in the cylinder ends which are 15 hardto keep tight owing to the extensive and long continued rectilineartravel of the connections. Our object therefore is to'de vise a wiperemploying only one cylinderin I whichthe-flexible connections to theWiper are not required to" pass through stufiing boxes and in which thetravel of the piston need notbe sci-extensive with that of the ip i i nWe attain-ourtobject by means of a; con- 1g structionwhichmay be brieflydescribed as follows. iston reciprocable in a closed cylinder has exibleconnectors secured thereto; one: at each end Journal led in each end ofthe cylinder, at right angles to its axis,

is ashort spindle extending through a stuffing-vbox in theawal l' ofthecylinder. Each spindle has twofldrums secured thereto, one insidean'dyone outside. "lhe piston connectorsl are secured to and wrap aroundthe 'inside drums. To a, suitably guided wiper is secured one" end ofeach oiwtwo flexible connectors the' other ends of which: are secured toand wrap aroundthe outside drums. Suit- .able passages, conduits andawiper operated 0 valve are provided" whereby opposite ends of thecylinder-may be? alternately putinto communication with the atmosphereand a source of suction; -I a The whole is constructed substantially ashereinafter more specifically described and as the accomp anyingdrawings in illustrated in which 5 v v a v v a i Fig. his afrearelevation,ipartlyin section,

015 a wiper constructed accordance" with our invention; i i i 1930.Serial No. 445,601.

ig. 2 is a similar view of parts of the same showlng a modification;

. F 3 an end elevation of the valve 5 Fig. 4 avertical transversesection of the same; and i V Fig". 5 a sectional elevation on theline 55in Fig. 1. 5 1 i p In the drawings like numerals of reference indicatecorrespondingparts in the different figures. i The device issupported'by means of two brackets l and 2, which are, when the deviceisin use, suitably secured to the vehicle above the windshield. Thesebrackets receive the ends of the cylinder-'3, parallel to which issupported the tube 4'. This tube and the cylin'derserve as aguidefor'the wiper carrier 5 on which' ishinged the wiper a-r'mt by means ofa j0urnal'7. coil spring 8' positi'one'd on the journal engages thewiper carrier and thewiper arm and tends to hold the wiper, not shown,in engagement with the windshield". Within the cylinder a piston 9 isadapted toreciprocate. J ournalled at each end' of the cylinder isaspindle 'lO'-exthe flexible connectors 14?. Each connector is secured atits other end'to, and is wrapped on, one of the inside drums 121 Similarconnectors l5-con'nect the wiper'ficarrierh' and the outsideclrumslg.From this construction it follows that by reciprocating the pistoncorresponding reciprocating movement is imparted to the wiper carrier.As the drums 12 and 13 may be made of diflerentdiameters any desiredratio may be obtained between the stroke of the piston and the stroke ofthe windshield wiper. In the modification shown'in. Fig. 2 the cylinderis formed with a central partition 16 through which exten'dsa piston rod17 connecting two pistons 9, the two connectors I b ends of the twopistons. A shorter piston stroke is thus obtained requiring a suitableproportioning of the inside drums to the outside drums to give thedesired longer movement of the wiper carrier. At one end of the wiper isformed a valve chest 18 provided with the central port 19, the vacuumports 20 and the atmospheric ports 21. The ports 20 are connected withopposite ends of the cylinder by the conduits 23 and '24, the tube 4forming part of the latter conduit. The central port will be connectedby a suitable conduit, not shown, with some source of suction,preferably the intake manifold of the engine of the vehicle. The valvechest is provided with a slide 25 provided with grooves 26, 27. 7 Itwill be evident on reference to Fig. 5 that by moving the slide onecylinder end may be brought into communication with the port 19 and theother end of thecylinder with the atmosphere or vice versa. I

I The slide may be actuated in any suitable manner. We show it asactuated through the medium of a pin 28 which projects upwardly throughthe actuating slide 29. Held in place by the cross bars 30 a bentspring31 engaging the valve slide 25 and the actuating slide 29 compresses theformer closely into contact with the valve chest. The actuating slide 29is operated through the medium of the bell cranklever 32 fulcrumed onthe end bracket 1. One arm of this bell crank lever projects over theactuating slide 29 and is connected with one end of a coil spring 33,the other endof which is connected with the lower end of the actuatinglever 34 fulcrumed on the valve chest and having its upper end bent overand positioned between shoulders 35 formed on the actuating slide 29.From this construction it follows that by suitably rocking the bellcrank lever 32'the axis of the spring may be shifted to one side 'or theother of the actuating lever 34, thus providing a snap-over action whichwill ensure rapid movement of the valve slide 25 from one position tothe other. The bell crank lever is actuated by means of a connecting rod36 which is'pivotallyconnected with the bell crank lever and one end ofa shifter rod 37 mounted to slide longitudinally of the cylinder 3. Thisshifter rod is provided at opposite ends with the tappets 38, whichpreferably embraces the tube 4. The wiper, by alternately engaging thesetappets, automatically shifts the valve at each end of its stroke asrequired. From the above description it will be seen that we havedevised a wiper which will satisfactorily operate with one cylinder onlyinstead of two as in our United States Patent #1,725,436 and whichdispenses with the necessity of carrying flexible connecting milmbersaxially through the ends of the cyl in er. a

for moving the said part. 7

2. In a device for actuating a movable part, the combination of acylinder, a piston rectilinearly-reciprocable 7 therein; a spindlejournalled at right angles to the axis of the cylinder and extendingwith a substantially air-tightfit through its wall means connected tothe piston for rotating the spindle; a rectilinearly movable part; andmeans actuated by the spindle for moving the saidpart, I

- 3. In a device for actuating a movable part, the combination of acylinder, a piston rectilinearly-reciprocable Y therein; a spindlejournalled at right angles to the axis of the cylinder and extendingwith a substantially air-tight fit through its wall means connected tothe piston for rotating the spindle; a rectilinearly movable part; andmeans actuated by the spindle for moving the said part at a ratedifferent to that of the piston.

'4. In a device for actuating a movable part, the combination of acylinder, a piston rectilinearly-reciprocable" therein; a spindlejournalled at right angles to the axis of the cylinderv and extendingwith a substantially air-tight fit through its wall means connected tothe piston for rotating the spindle; a rectilinearly movable part; andmeans actuated by the spindle for moving the said part comprising adrumfixed to the outer end of the spindle, and a flexible connectorsecured at one. end to the'said part and at its other 'end to the saiddrum. i I

5. In a device for actuating a movable part, the combination, of acylinder, a pistonjrectilinearly-reciprocable .therein; a spindle.journalled at right. angles to the axis of the cylinder and extendingwith a substantially air-tight-fit through-its wa-ll means connected tothe piston for rotating the spindle comprising a drum fixed to theinnerend of the spindle, and a flexible member secured at one end to thepiston and at its other end to the said drum. Y v

6. In a device for actuating a movable part, the combination of acylinder, a piston rec- 'tilinearly-reciprocable. therein; a spindlejournalled at right/angles to the axis of the cylinder and extendingwith a substantially air-tight fit through its wall means connected to.the piston for rotating the spindle comprising a drum fixed to theinnerend of the spindle, and a flexible member secured at one end to thepiston and at its other end to the said drum; a rectilinearly movablepart; and means actuated by the spindle for moving the said partcomprising a drum fixed to the outer end of the spindle, and a flexibleconnector secured at one end to the said part and at its other end tothe said drum.

7. In a device for actuating a movable part, the combination of twoclosed cylinders arranged end to end with a stuffing box between them; apiston in each cylinder; a piston rod connecting the pistons and passingthrough its stuifing box; spindles j ournalled at right angles to theaxes of the cylinders, one at a the outer end of each and extending witha substantially air tight fit through its wall; means connected to eachpiston for rotating the adjacent spindle; a movable part; and meansactuated by the spindles for moving the said part alternately inopposite direc' tions when the pistons are reciprocated.

Signed at Kitchener, Ontario, this seventh day of April, 1930.

NORMAN WILLIAMS.

HERMAN MITTERMEIER.

